formula

type Area struct {
	Sheet    string
	From, To Ref
}

type AreaBook interface {
	Book
	Area(sheet string, c1, r1, c2, r2 int) (rows [][]Value, cells *Run)
}

type Binary struct {
	Op   string
	L, R Node
}

type Book interface {
	Cell(sheet string, col, row int) Value
}

type Bool bool

type Call struct {
	Name string // upper case, without prefix
	Args []Node
}

type Context struct {
	Book  Book
	Sheet string // the sheet of the cell, for references without a sheet
	Row   int    // the row of the cell, for Here references
	Today time.Time
	// Volatile is set when the formula reads TODAY(): its value changes
	// with the day it is computed.
	Volatile *bool
	// Unportable receives what the formula did that the apps compute
	// differently, such as joining TRUE into text.
	Unportable func(string)
}

type Err string

type Kind uint8

type Node interface {
	// contains filtered or unexported methods
}

type Num float64

type Ref struct {
	Sheet          string
	Col, Row       int
	AbsCol, AbsRow bool
	Here           bool
	Name           string // a defined name the file stores instead of the address
}

type Resolver func(name string) (Node, error)

type Run struct {
	Values []Value
	// contains filtered or unexported fields
}

type Str string

type Unary struct {
	Op string
	X  Node
}

type Value struct {
	Kind Kind
	Num  float64
	Str  string // text, or the error code
	Rows [][]Value
	// contains filtered or unexported fields
}